Bill wants to see how many times he needs to roll a standard number cube before getting a 5. What is the probability that Bill will roll a 5 on his third roll and not before?
a. 125/1296
b. 25/216
c. 1/6
d. 1/2

ANSWERS

2016-09-26 05:40:20

5/6 • 5/6 • 1/6 = 25/216 the answer is b

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